1970s
By 1975, CBS had several themes (technically, CBS had different opening songs and graphics per crew) to open their broadcasts. They ranged from David Shire's "Manhattan Skyline" from the Saturday Night Fever soundtrack to "Fly, Robin, Fly" by the Silver Convention.
From roughly, 1977-1979, CBS used the disco-style version of John Williams' main theme from Star Wars.
See also: Star Wars Theme/Cantina Band and Star Wars musicRead more about this topic: NFL On CBS Music